Footwear with an adjusting system of a width dimension

ABSTRACT

A footwear has a sole comprising at least a resilient component having a peripheral profile, with a medial part and a lateral part which define therebetween a width dimension. To the resilient component an adjusting system is associated, operable in order to select a desired adjusting degree of the width dimension. The sole comprises inspection means arrangede for allowing the visual check, from the lower part of the sole, of the adjusting degree selected by means of the adjusting system.

BACKGROUND OF THE INVENTION

The present invention relates to a footwear including an adjusting system, suitable for allowing to adapt the shape of the footwear itself to the one of a user's foot.

It is known that, on the same length, the feet of different persons can vary in shape and width and that even the right and left feet of a same person can be different from each other. The greatest size differences are found in the width, especially in the zone of the sole of the foot.

For this reason, given a certain length, an identical footwear model should ideally be carried out in a multitude of versions, differentiated from each other in terms of width or “fitting”, corresponding to the size of the plan circumference passing between the 1^(st) and the 5^(th) metatartsus.

De facto, the manufacturers perform a mediated choice of versions to be produced, as a function of the sale market of the footwear, its use destination, employed materials, construction typology. In each case, however, some different versions of an identical footwear model must be carried out, which, on the same length, are “larger” or more “narrow”, in order to satisfy the feet variability.

Such productive diversification, as far as it is the result of a reasonable productive compromise, involves problems both for the footwears manufacturer, which has to arrange, anyway, different plants for shapes, soles, uppers, etcetera, and for the retailers, which have to buy a greater number of versions of the same model of footwear, trying to satisfy the various requirements of the end customers. It goes without saying that some customers will have to buy, however, slightly larger or more narrow footwears, if their feet do not correspond to the “mediated” dimensions of the various available versions.

In view of solving these drawbacks, the document U.S. Pat. No. 5,813,146 proposes a footwear having an adjusting system conceived for allowing to adapt the shoe to the user's foot. The footwear includes an upper and a sole which, in its metatarsal zone, presents a discontinuity of material, in correspondence of which adjusting means are operative. The sole includes in particular at least an intersole, made of an elastically yielding material, and the aforesaid discontinuity can consist of a void, such as a slot formed in the intersole, or of an insert of a more yielding material relative to the one forming the rest of the intersole, or still of a small air chamber placed in the ambit of the intersole. The intersole thus conceived is positioned between the upper of the footwear and an outer sole of the same.

In one of the possible embodiments described in U.S. Pat. No. 5,813,146, the adjusting means include threaded rods, placed transversally to the intersole and fixed at a central part of this latter; on the ends ot such fixed threaded rods respective bushings with female thread are screwed, whose heads are accessible on the outer profile of the intersole, in opposite parts of this latter. Each of such heads is equipped with a notch, susceptible of co-operation with a suitable tool so as to screw or unscrew the bushing on the respective threaded rod, for determining the compression or allowing the expansion of a corresponding portion of the discontinuity of material. In this way, it is possible to adjust in an independent way the width of the sole in multiple points of the metatarsal zone, between an ideal central longitudinal axis and the periphery of the sole itself, so as to adapt the shape of the sole profile to the user's foot.

SUMMARY OF THE INVENTION

The aim of the present invention is to carry out an improvement of the known art above mentioned, in particular for the purpose of render easier the adjustment step of the width of the footwear, either if it is carried out by the manufacturer, the retailer or the end user.

These and further objects, which will result more evident hereinafter, are attained according to the present invention by a footwear having the features shown in the appended claims, which form an integral part of the descriptive content of the present application of utility model.

BRIEF DESCRIPTION OF THE DRAWINGS

Further objects, as well as the features and the advantages of the present invention will result evident from the following description and the enclosed drawings, which are given by mere way of explanatory and not limitative example, wherein:

FIG. 1 is an elevational and partly sectional diagrammatic view of a sports footwear carried out according to the invention;

FIG. 2 is a diagrammatic bottom view of the body of a sole component of the footwear of FIG. 1;

FIGS. 3 and 4 are two diagrammatic side views of the component of FIG. 2, of a medial part and a lateral part of the peripheral edge or profile of such component, respectively;

FIG. 5 is a plan diagrammatic view of an insert forming part of an adjusting system of the footwear according to the invention;

FIGS. 6 and 7 are diagrammatic sections according to the lines VI-VI and VII-VII of FIG. 5;

FIG. 8 is a front diagrammatic view of the insert of FIG. 5;

FIG. 9 is an elevational diagrammatic view of two components forming part of the adjusting system of the footwear according to the invention;

FIG. 10 is a diagrammatic side view of two screws forming part of the adjusting system of the footwear according to the invention;

FIG. 11 is a diagrammatic bottom view of the component of FIG. 2, equipped with the adjusting means of FIGS. 5-10, in a first possible configuration;

FIG. 12 is a diagrammatic side view of the component of FIG. 11;

FIG. 13 is a diagrammatic bottom view of a footwear according to the invention;

FIG. 14 is a section according to the line XIV-XIV of FIG. 13;

FIG. 15 is a view similar to that of FIG. 11, but with the respective component in a second configuration;

FIGS. 16 and 17 are diagrammatic sections, similar to those of FIGS. 6 and 7, of an insert carried out according to a possible variant of the invention;

FIG. 18 is a diagrammatic section, substantially similar to that of FIG. 14, for showing a possible variant of the invention, using the insert of FIGS. 16 and 17;

FIG. 19 is a diagrammatic section, substantially similar to that of FIG. 14, for showing another possible variant of the invention, using the insert of FIGS. 16 and 17;

FIGS. 20 and 21 are two partial and diagrammatic sections of the component of FIG. 11 or 15, carried out according to another possible variant of the invention;

FIGS. 22 and 23 are a diagrammatic bottom view and a diagrammatic side view, respectively, of a component similar to that of FIG. 2, according to another possible variant of the invention.

DETAILED DESCRIPTION OF THE INVENTION

In FIG. 1, a general sport footwear carried out according to the invention is generally indicated by 1, having an higher part or upper 2 and a lower part or sole; in the exemplary case, the sole comprises a lower or outer sole 3 and an intersole 4.

The type of embodiment of the upper 2 leaves out the purposes of the present invention and therefore it will not be described and shown in detail.

The outer sole 3 is made of a synthetic material, for example rubber with a differentiated hardness; in the exemplified case, in the outer sole 3 two portions 3 a and 3 b are found, each one defining a part of tread, for the back part and the front part of the footwear 1, respectively; between the two parts of outer sole 3 a and 3 b, in correspondence with the zone of the waist edge of the footwear 1, an intermediate portion 3 c is foreseen, which does not necessarily perform tread functions. It should be noted that the outer sole 3 could also be formed in multiple discrete pieces stuck to the intersole 4, such as for example a back part, defining the portion 3 a, a front part, defining the portion 3 b, and an intermediate part defining the portion 3 c.

The intersole 4 has a body 4 a presenting an upper face, a lower face and a side edge or peripheral profile, this latter having a first tract, shown by 4 a′ in FIG. 2 and in the following defined as medial tract, and a second tract, shown by 4 a″ in FIG. 2 and in the following defined as lateral tract; the medial tract 6 a′ is substantially the part of the peripheral profile of the intersole 4 which is faced towards the other foot of the user, when the footwear is worn, while the lateral tract 4 a″ is substantially the part of the peripheral profile opposite to the medial one.

The intersole 4 is positioned between the upper 2 and the outer sole 3, and upon it, within the footwear 1, an arch support or plantar is foreseen, if necessary, of an extractable type, not shown; for this purpose, the intersole 4 defines in its higher zone a depression 4 b, in which ambit the aforesaid arch support finds at least a partial housing.

The body 4 a of the intersole 6 can be obtained by molding of an elastic, soft and light material, such as for example EVA, and then associated with the upper 2, for example of sticking in peripheral zones of its higher face; to the lower face of the intersole 4, equipped with adjusting means which will be described hereinafter, the outer sole 3 is successively associated, preferably through sticking.

In FIGS. 2-4 the body 4 a of the intersole 4 is depicted. As it can be seen in FIG. 2, in the front part of the body 4 a, and particularly in the metatarsal zone, a discontinuity of material is foreseen, indicated by 8; in the exemplified case, such discontinuity consists of a hollow or void in form of a slot, which extends itself lenghtwise in the same direction of longitudinal extension of the intersole 4. Alternatively to a hollow or a void, the discontinuity 8 could also be constituted by an insert or a body part formed in a material more easily compressible than the one forming the rest of the body 4 a, or by a small air chamber, similarly to what described in the U.S. Pat. No. 5,813,146 already mentioned, whose teachings regarding this are incorporated herein by reference.

In the body 4 a two housings, indicated by 9, are further formed, substantially parallel to each other (although if such parallel arrangement is not strictly necessary) and which extend themselves transversally with respect to the body 4 a and/or with respect to the longitudinal development of the slot 8.

Each housing 9 presents a first end portion configured as a cylindrical hole, indicated by 9 a, having an end which opens on the medial tract 4 a′ of the peripheral profile of the body 4 a; the other end of the hole 9 a ends in correspondence with a substantially parallelepiped-shaped first seat 9 b, opened on the lower face LF of the body 4 a; adjacent the first seat 9 b a further small seat 9 b′ is foreseen, having dimensions lower than the seat 9 b and also opened on the lower face LF of the body 4 a.

From the seat 9 b′, the housing 9 then proceeds with a substantially U-shaped groove 9 c, also opened on the lower face LF of the body 4 a; the groove 9 c of each housing extends lengthwise transversally to the slot 8. The housing 9 finally ends with a second seat 9 d, with a complex shape conformed for housing at least part of a respective insert, one of which is depicted with different views in the FIGS. 5, 6, 7 and 8, where it is indicated by 11. In the example, the seat 9 d is slightly recessed relative to the lateral tract 4 a″ of the peripheral profile of the body 4 a.

In the FIGS. 5-8, only one of the inserts 11 is shown in different views, in view of the fact that the other insert is of a substantially similar shape. The insert 11 presents a small-plate base 11 a, from an end of which a front wall 11 b is orthogonally raised, having a respective groove-shaped passage 11 b″; in the central zone of the base 11 a, from the same side from which the wall 11 b is raised, a cylindrical tube 11 c, internally threaded and opened at both the ends, is defined, the passage 11 b′ and the tube 11 c being substantially coaxial to each other. In the surface of the base 11 a opposite to the one in which the walls 11 b and the tube 11 c are raised, a substantially U-shaped relief or projection 11 d is present, aligned at the open bottom of the tube itself.

The seat 9 d is shaped so as to have

a first portion 10 a, intended to receive the front wall 11 b of the insert 11,

a second portion 10 b, intended to receive the tube 11 c of the insert 11, and

a third portion 10 c, intended to receive the base 11 a of the component 11, such that its surface from which the relief 11 d is protruding results substantially flush with the surface of the lower face of the body 4 a of the intersole 4.

It should be noted that between the portions 10 a and 10 b, a tract of seat 10 d is also formed, which performs a sort of extension of the groove 9 c of the housing 9.

The seat 9 b is foreseen in order to house a small plate 12, visible in FIG. 9, which has a wholly parallelepiped shape and is equipped with a groove-shaped passage 12 a.

In FIG. 10 two screws or adjusting rods are visible, indicated by 13, each one intended to co-operate with a respective insert 11. Each screw 13 has a respective head 13 a, having a notch 13 a′ (see FIG. 10), a substantially cylindrical intermediate part 13 b and a threaded end part 13 c; on the part 13 c two small flanges or washers 13 a′ and 13 d are foreseen; the washer 13 a′ is at a short distance from the head 13 a, while the washer 13 d is in correspondence with the end of the thread.

The body 6 a of the intersole 6 can be molded, with procedures and means known per se, so as to present the slot 8 and the housings 9. In each hole 9 a a respective screw 13 is threaded, the threaded end 13 c of which is then partly screwed in the tube 11 c of the insert 11, with the washer 13 d being positioned between the front wall 11 b and the tube 11 c of the insert itself; such operation is allowed by the elasticity of the material forming the body 4 a and since the parts 13 b, 13 d of the screw 13 are of such a diameter that they can pass in the ambit of the passage 11 b′ of the front wall 11 b of the insert 11.

The insert 1 is then introduced in the respective seat 10, with the surface of its base 11 a substantially flush with the surface of the lower face of the body 4 a; in each seat 9 b a respective small plate 12 is then introduced, such that its passage 12 a is fitted on the cylindrical portion 13 b of the screw 13; so the small plate 12 became then positioned between the head 13 a and the washer 13 a′ of the respective screw 13. Finally, the small plate 12′ of FIG. 9 is slipped on the screw 13, such that the passage 12 a′ results fitted on the threaded part 13 c of the screw itself, between the washer 13 d and the front wall 11 b of the insert 11.

After the aforesaid operations, the intersole 4 is substantially as depicted in FIG. 11. For the purposes of the assembly, the screw 13 can be screwed in the tube 11 c in a predefined position, for example as visible in FIG. 11; in such case, the washer 13 d, which is, as already mentioned, at the limit of thread of the end 13 c, is in contact against the small plate 12 a′ which is in turn in contact against the front wall 11 b of the insert 11.

In the assembled condition and as it can be seen in FIG. 12, in correspondence with the holes 9 a on the medial tract 4 a′ of the peripheral profile of the intersole 4 the heads 13 a of the screws 13 result accessible, and thanks to the presence of the respective notches 13 a′, can be rotated, for example by means of a screwdriver.

According to the main aspect of the invention, the footwear 1 has inspection means, intended to allow the visual control of the adjusting degree, in correspondence with a zone of the sole 3, 4 which is intermediate with respect to the medial 4 a′ and lateral 4 a″ tracts of its outer profile.

For this purpose, in the exemplified embodiment, the body of the insert 11 is made of a substantially transparent plastic material and the outer sole 3, in its front part 3 a, is equipped with openings or passages, suitable for allowing the direct view of at least a part of a respective transparent insert 11.

In FIG. 13 the footwear 1 is depicted through a bottom view, while in FIG. 14 a partial section of the sole 3, 4 is depicted. As it can be seen, in the part 3 a of the lower or outer sole two passages or holes are foreseen, each one located in correspondence with the projection 11 d of a respective insert 11. As it can also be seen in FIG. 14, the peripheral zone of the base 11 b of the insert 11 is covered by the outer sole 3, so as to ensure the positioning of the insert itself in the ambit of the respective seat formed in the body 4 a of the intersole.

Through the passages 15 and the transparent body of the inserts 11 it is possible to visually check the extent of the screwing of the threaded portion 13 c of each screw 13 in the respective tube 11 c, that is of their co-operation or coupling degree. For this purpose, on the surface of the base Ha of the insert intended to remain exposed in corrispondence with a respective passage 15, reference notches can be suitably formed, useful for the adjusting purposes.

For the purposes of carrying out of the footwear 1, therefore, after the obtainment of the intersole 4 equipped with the adjusting means 11-13, on the lower face LF of the intersole itself the outer sole is stuck, such that the passages 15 result positioned as previously described.

The functioning of the adjusting means of the footwear is very easy. After the screwing of a screw 13, the respective head 13 a presses on the adjacent small plate 12, with the consequence that the part of the body 4 a of the intersole 4 a which is between such small plate 12 and the button hole 8 is forced towards the insert 11, and/or this latter is pulled towards the small plate 12; this determines a compression of the discontinuity 8, which allows to obtain a width decrease of the intersole 4, and therefore a modification of the shape of its peripheral profile.

In FIG. 15 the maximum screwing situation of the two screws 13, determined by the contact of the respective washers 13 d on the front end of the respective tubes 11 c of the inserts 11, is depicted; it should be noted that in such a figure the outer sole 3 has not been shown, for greater clarity sakes. As it can be seen, in such condition the discontinuity 8 results substantially compressed, with a consequent decrease of the width of the intersole 4 in the metatarsal zone; always in FIG. 15, the dotted part points out the shape of the peripheral profile of the intersole 4 in a non adjusted condition, namely as in the case depicted in FIG. 11. On the contrary, starting for example from the configuration of FIG. 15, by unscrewing the screws 13 the discontinuity 8 tends to expand itself, thanks to the elasticity of the material forming the intersole 4, returning in the configuration of FIG. 11.

In each case, the extent of the adjustment carried out through the screws 13 can be visually controlled with accuracy, through the passages 15 and the transparency of the material forming the inserts 11; as mentioned, the inserts could be equipped of proper indicating notches. As it can be assumed, therefore, the width or the “fitting” of the shoe according to the invention can be accurately personalized in an easy and repetitive manner. This is particularly advantageous, besides for the manufacturers and the retailers of footwears, also for the end users. For example, in some circumstances, a user will be able to provisionally change the adjustment in view of a particular use situation of the footwear, however having then the possibility of re-establish the initial adjustment, thanks to the possibility of physically precisely observe, and therefore remember, the initial adjustment degree through the passages 15 and the transparency of the inserts 11.

Of course, construction details and embodiments could widely vary with respect to what has been described and shown by mere way of example, without leaving the ambit of the present invention.

For example, the body of the component 11 could also be made of an opaque material, with its base portion 11 a having a slot longitudinally extending in correspondence with the threaded tube 11 c. Such a variant is diagramatically depicted in FIGS. 16 and 17, wherein the aforesaid slot is indicated by 11 e. In this way, through the slot 11 e it is possible to see the threaded end 13 c of the screw 13, and therefore visually check the adjustment degree; for this purpose, on the base 11 a reference notches could be also foreseen. In this embodiment, the zone wherein the slot 11 e is located can be suitably covered by a thin layer of transparent material; as visible for example in the section of FIG. 18, such layer can consist of a transparent element 11 f interposed between the intersole 4 and the outer sole 3, or being directly constituted of a transparent portion of the outer sole 3, as it can be seen in FIG. 19.

Without considering the selected implementation and for the purpose of making easier the vision of the adjustment degree, the screws 13 or the means which replace them could have at least in part a colouring which contrasts with the one of the material forming the body 4 a of the intersole 4 and/or the outer sole 3.

In an alternative embodiment, the extent of the adjustment could also be made visible through the position of the washer 13 d, instead of the threaded end of the respective screw 13; in this case, with an insert 11 having the slot 11 e, this latter will be obviously obtained in correspondence with the tract of the stroke allowed for the washer 13 d, such stroke being produced by the movement of the respective screw 13.

On the slot 8, in case it is formed by a void crossing the body 4 a, a covering stuck on the upper face of the body itself can be foreseen; such a covering, comprising for example a fabric or an elastic or flexible material sheet, is indicated by 14 and diagrammatically depicted in section in two conditions in FIGS. 20 and 21, corresponding to the two situations of extreme adjustment in FIGS. 11 and 15, respectively.

In the FIGS. 22 and 23 an embodiment of the invention is finally depicted, wherein in the body 4 a of the intersole a single housing 9 is foreseen and wherein the adjusting means are formed by a single insert 11 and a screw 13, with the respective two small plates 12, 12′. The adjustment, in the case of the variant of FIGS. 22, 23 occurs with the same procedures previously explained.

In the embodiments previously exemplified, the adjustment of the width or “fitting” allows to obtain a substantially symmetrical variation of the peripheral profile of the footwear, that is the adjustment is carried out in substantially equal proportions between the medial 4 a′ and the lateral 4 a″ tracts of said profile. Nothing prevents, in principle, to foreseen an adjustment in independent points, for example as described in U.S. Pat. No. 5,813,146, being understood that for one or more adjusting means respective inspection means will be foreseen, accessible from the lower face of the sole 3, 4 and particularly formed at least partly in the lower sole 3. Also the adjusting means could foresee a mutual coupling other than the threaded one previously described, and being for example in form of small plates co-operating together in a varying manner through respective teeth or ratchet gears, similarly to what has been described in the mentioned U.S. Pat. No. 5,813,146, whose teachings concerning this aspect are considered incorporated herein by reference.

For intersoles made of an extremely elastic and yielding material, the body 4 a could be possibly overmolded directly to the adjusting means, which in this case should be previously assembled together and directly placed within the overmolding mold.

The invention has been described with a particular reference to a sport footwear, but it is evident that the same is susceptible of application also to other kinds of shoes. 

1. A footwear having an upper and a sole, the sole comprising at least a resilient component having a peripheral profile with a medial part and a lateral part, said parts defining therebetween a width dimension, a discontinuity of material arranged for allowing a variation of said width dimension, and therefore a shape variation of said peripheral profile, wherein to the resilient component an adjusting system is associated, operable in order to select a desired adjusting degree of said width dimension, in particular for the purpose of adapting the shape of said peripheral profile to a foot of a user of the footwear, wherein said sole comprises inspection means arranged for allowing the visual check, in a zone of said resilient component which is intermediate with respect to said medial and lateral parts, of the adjusting degree selected by means of said adjusting system.
 2. Footwear according to claim 1, wherein said inspection means are configured in order to allow said visual check from the lower part of the sole.
 3. Footwear according to claim 1, wherein said inspection means comprise a component made at least partly of a substantially transparent material.
 4. Footwear according to claim 1, wherein said discontinuity of material is formed in said resilient component substantially in correspondence with the metatarsal region of the sole.
 5. Footwear according to claim 1, wherein said adjusting system comprises at least a first element and a second element susceptible of co-operation in a varying extent and that said inspection means are arranged for allowing a visual check of the co-operation degree between the first and the second elements.
 6. Footwear according to claim 5, wherein within said resilient component at least a first housing for said first and second elements is formed, said housing transversally extending itself relative to a longitudinal development of said discontinuity of material.
 7. Footwear according to claim 5, wherein said first and second elements co-operate together by means of a threaded coupling.
 8. Footwear according to claim 7, wherein said first element comprises an insert having a hollow part with a female thread and said second element comprises a screw element having a respective head and at least a threaded end part, susceptible of screwing in said hollow part of the first element.
 9. Footwear according to claim 8, wherein said insert is made at least partly of a transparent material and forms at least part of said inspection means.
 10. Footwear according to claim 8, wherein said insert has a slot or notch which forms at least part of said inspection means.
 11. Footwear according to claim 1, wherein said resilient component is an intersole, that said sole further includes an outer or lower sole fixed to said intersole and that said inspection means include at least one of an opening or passage formed in said outer sole, at least a part of said outer sole made of a transparent material, a transparent element at least partly interposed between said intersole and said outer sole.
 12. Footwear according to claim 1, wherein at least a portion of said housing is configured as a cylindrical hole opened on said peripheral profile, in particular on said medial part.
 13. Footwear according to claim 1, wherein at least a portion of said housing is configured as a cavity opening on a greater face of said resilient component.
 14. Footwear according to claim 13, wherein said cavity is conformed for housing at least part of an insert having a surface intended to remain substantially flush with a surface of the lower face of the resilient component.
 15. Footwear according to claim 1, wherein said discontinuity of material includes at least one of a hollow or a void formed in the resilient component; an insert or a part of the body of the resilient component made of a more compressible material than the material forming the rest of the resilient component; a chamber containing a fluid. 